Improvement in combination-locks



Nrrnn STATES PATENT j,

FFCE.

IMPROVEMENTIN coMBlNATloN-LQCKS.

Specification forming part of Letters Patent No. 146,201, dated January6, 1874; application ld November 8, 1873.

To all whom 'it may concern:

Be it known that I, ARTHUR E. PrcKLn, of Nevada, in the county of Vernonand State of Missouri, have invented a new and ImprovedPern1utationLock, of which the following is a specification In theaccompanying drawings, Figurerll applications for which the more complexconstrnctions of permutation-locks are less advantageous on account oftheir size and expense.

My invention consists ot' a rotating plate, having a projecting pin atone end, which engages the locking-bolt, so as to withdraw the saine inpart by means of the inner pin of a 'rotating dial-plate acting upon aprojecting band-spring, attached to the rotating plate. Tlfe withdrawalof the lock-bolt is completed by the action of a second pin of thedial-plate on the bolt, which is recessed and provided with inclinedfront and rear projections for the same. The pins of the diatplate maybe changed to any combination of letters by being placed into any twoholes of the concentric series of perforations provided therein.

In the drawing, A represents the back rotating plate, which is of diskor other shape, and turns freely on the central bolt a.. Atdiametrically-oliiposite points of plate'A are arranged the fixed pin band the outward-projecting band-spring d. Pin b is placed at or near theouter periphery of plate A, so as to engage the slightly projecting toppart of bolt B and raise the same from its seat. Bolt B slides in arecess of the door or frame to which the lock is applied, and is formedin such a shape that the top part is of T-shaped crosssection, asindicated in Fig. 2, with raised projections b', said projections havinginclined sides against which the pins b and g act in rl`he dial-plate Cro- V withdrawing the bolt. tates also freely on central bolt a, or on adiskshaped head of the same, and is turned by a knob or button, c. `Anouter and inner concentric series of perforations, f, of the dialplateG, correspond in number and position with the letters or ligures stampedthereon. Two pins, g and g', are placed into dial-plate C, one,g, in theinner, and the other, g', in the outer series of perforations f, underany desired combination of the letters, which may be formed thereby. Thepins g and g project from the rear side of dial plate C, the inner pin gserving to engage the band-spring d, when carried against the edge ofthe same,but passing easily over the spring from the opposite direction.When, therefore, thedial-plate is turned so as toengage, by inner pin g,spring d ofrotating plate A, and to carry the same along till thecorresponding letter is placed diametrically opposite to bolt B againsta suitable index or a recess, h, of top or incasing plate D, the pin braises the bolt B as far as permitted by the inclined rear projection b.the dial-plate in opposite direction till the second letter is broughtinto recess h, diametrically opposite to outer pin g', bolt` B isthereby engaged at its front projection b and entirely raised from itsseat, so that the door i may be thrown open. It is evident that theouter perforations of the dial-plate have to be arranged at suchdistance from the circumfen ence that the outer pin g withdraws, bymeans of the inclined front projection b', the bolt entirely from itscontact with the socket or seat. .p By straigthening or recessingslightly the lowermost point of bolt projections b the pins catch moreefiectivelyitherein and secure/more fully the exact movements of thebolt. The bolt is thrown down or outward into its groove by its owngravity as soon as the rotating dial-plate is turned, on closing thepivoted door to which the lock is applied into a vertical position.

Having thus describedmy invention, I claim as new and desire to secnrebyLetters Patent- 1. The permutation-lock, consisting of dialplate C,providedwith changeable settingpins z By turning then b7 andoutward-projecting band-spring` d, as described.

et. The sliding` bolt B, having top part with T-shaped cross-section,and inclined face and rear projections b', substantially as and for thepurpose set forth.

Witnesses: ARTHUR E. PICKLE.

FRANK BLooKLEY,

PAUL GOEPEL.

